Pinned topicF5 and Websphere - 404 page error

‏2009-12-31T22:52:47Z
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When we hit the site with http, it should redirect us to https instead we will get 404 error. When this happened, we have to failover to the standby F5 and everything will be fine again. We used to have this problem occurred every couple of days but after we made a few changes to the http rule everything seems to be a little more stable and this only occurred one after couple weeks (basically we just made it simple and use mostly default settings since it will be redirected to https). We took some TCPDump, and it seems to be when the problem occurred, this will appear and keep redirecting us to the following but we do not know what causing it neither nor F5 engineer:

Just curious, what does contenthandler does?:
/wps/contenthandler/mmsi/!ut/p/spa//6_1LFQFV3300O800IOVSB89B2085/html/mmsi?digest=N_5daMHgbyRiOPvt7gua6g!!
HTTP/1.1 301 Moved Permanently